package com.hmdp.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

/**
 * @author zhupanlin
 * @version 1.0
 * @description: TODO
 * @date 2024/4/1 11:23
 */
@Component
public class RedisIdWorker {

    /**
     * 开始时间戳
     */
    private static final long BEGIN_TIMESTAMP = 1640995200;
    /**
     * 序列号的位数
     */
    private static final long COUNT_BITS = 32;



    @Resource
    StringRedisTemplate stringRedisTemplate;
    
    public long nextId(String keyPrefix){
        // 1.生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp = nowSecond - BEGIN_TIMESTAMP;
        // 2.生成序列号
        // 2.1获取当前日期，获取到天
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        // 2.自增长
        long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);
        // 3.拼接并返回
        
        return timestamp << COUNT_BITS | count;
    }

    public static void main(String[] args) {
        LocalDateTime of = LocalDateTime.of(2022, 1, 1, 0, 0, 0);
        long second = of.toEpochSecond(ZoneOffset.UTC);
        System.out.println("second = " + second);
    }
    
}
